<template>
  <div>
    <!-- 面包屑导航区域 -->
    <el-breadcrumb separator-class="el-icon-arrow-right">
      <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
      <el-breadcrumb-item>商品管理</el-breadcrumb-item>
      <el-breadcrumb-item>参数列表</el-breadcrumb-item>
    </el-breadcrumb>

    <!-- 卡片视图区域 -->
    <el-card>
      <!-- 警告区域 -->
      <el-alert title="※ 注意:只允许为第三级分类设置相关参数" type="warning" :closable="false" show-icon> </el-alert>
      <!-- 选择商品分类区域 -->
      <el-row class="shop">
        <el-col>
          <span>选择商品分类:</span>
          <!-- 选择商品分类的级联选择框  options指定数据源-->
          <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" @change="handleChange" clearable></el-cascader>
        </el-col>
      </el-row>

      <!-- tab 页签区域 -->
      <el-tabs v-model="activeName" @tab-click="handleTabClick" type="border-card">
        <!-- 添加动态参数面板 -->
        <el-tab-pane label="动态参数" name="many">
          <!-- 添加动态参数按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParamsDialogVisible = true">添加参数</el-button>
          <!-- 动态参数表格 -->
          <el-table :data="manyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="removeClose(i, scope.row)">{{ item }} </el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="参数名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-deit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
        <!-- 添加静态参数面板 -->
        <el-tab-pane label="静态属性" name="only">
          <!-- 添加静态属性按钮 -->
          <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addParamsDialogVisible = true">添加属性</el-button>
          <!-- 静态属性表格 -->
          <el-table :data="onlyTableData" border stripe>
            <!-- 展开行 -->
            <el-table-column type="expand">
              <template slot-scope="scope">
                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="removeClose(i, scope.row)">{{ item }} </el-tag>
                <!-- 输入文本框 -->
                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"> </el-input>
                <!-- 添加按钮 -->
                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
              </template>
            </el-table-column>
            <!-- 索引列 -->
            <el-table-column type="index"></el-table-column>
            <el-table-column label="属性名称" prop="attr_name"></el-table-column>
            <el-table-column label="操作">
              <template slot-scope="scope">
                <el-button type="primary" icon="el-icon-deit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
              </template>
            </el-table-column>
          </el-table>
        </el-tab-pane>
      </el-tabs>
    </el-card>

    <!-- 添加参数对话框 -->
    <el-dialog :title="'添加' + titleText" :visible.sync="addParamsDialogVisible" width="50%" @close="addDialogClose">
      <!-- 添加表单参数对话框 -->
      <el-form :model="addForm" :rules="addFormRules" ref="addFormRef" label-width="110px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="addForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="addParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="addParams">确 定</el-button>
      </span>
    </el-dialog>

    <!-- 修改参数对话框 -->
    <el-dialog :title="'修改' + titleText" :visible.sync="editParamsDialogVisible" width="50%" @close="editDialogClose">
      <!-- 修改表单参数对话框 -->
      <el-form :model="editForm" :rules="editFormRules" ref="editFormRef" label-width="110px">
        <el-form-item :label="titleText" prop="attr_name">
          <el-input v-model="editForm.attr_name"></el-input>
        </el-form-item>
      </el-form>
      <span slot="footer" class="dialog-footer">
        <el-button @click="editParamsDialogVisible = false">取 消</el-button>
        <el-button type="primary" @click="editParams">确 定</el-button>
      </span>
    </el-dialog>
  </div>
</template>
<script>
export default {
  data() {
    return {
      // 商品分类列表
      catelist: [],
      // 级联选择框的配置对象
      cateProps: {
        expandTrigger: 'hover',
        value: 'cat_id',
        label: 'cat_name',
        children: 'children'
      },
      //级联选择框双向绑定 父级分类的id数组
      selectedCateKeys: [],
      //被激活页签名称  默认第一页
      activeName: 'many',
      // 动态参数的数据
      manyTableData: [],
      // 静态属性的数据
      onlyTableData: [],
      // 控制参数对话框的显示与隐藏
      addParamsDialogVisible: false,
      // 添加参数 表单的数据对象
      addForm: {
        attr_name: ''
      },
      //添加表单的验证规则对象
      addFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      },
      //控制修改对话框的显示与隐藏
      editParamsDialogVisible: false,
      //修改表单的数据对象
      editForm: {},
      // 修改表单的验证规则对象
      editFormRules: {
        attr_name: [{ required: true, message: '请输入参数名称', trigger: 'blur' }]
      }
    }
  },
  created() {
    //获取商品分类列表数据
    this.getCateList()
  },
  methods: {
    async getCateList() {
      const { data: res } = await this.$http.get('categories')
      if (res.meta.status !== 200) {
        return this.$message.error('获取商品分类数据失败!')
      }
      this.catelist = res.data
      console.log(this.catelist)
    },
    //级联选择框 选中变化 会触发的函数
    handleChange() {
      this.getParamsData()
    },
    //tab 页签点击事件的处理函数
    handleTabClick() {
      console.log(this.activeName)
      this.getParamsData()
    },
    //获取参数的列表数据
    async getParamsData() {
      // 选中的不是三级分类
      if (this.selectedCateKeys.length !== 3) {
        this.selectedCateKeys = []
        this.manyTableData = []
        this.onlyTableData = []
        return
      }
      // 选中的是三级分类
      console.log(this.selectedCateKeys)

      //根据所选分类的Id,和当前所处的面板,获取对应的参数
      const { data: res } = await this.$http.get(`categories/${this.threeId}/attributes`, {
        params: { sel: this.activeName }
      })
      if (res.meta.status !== 200) {
        return this.$message.error('获取三级参数列表失败')
      }

      res.data.forEach(item => {
        item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : []
        //控制文本输入框跟按钮的的切换 默认为false
        item.inputVisible = false
        // 输入文本框得内容
        item.inputValue = ''
      })
      console.log(res.data)
      if (this.activeName === 'many') {
        this.manyTableData = res.data
      } else {
        this.onlyTableData = res.data
      }
    },
    addDialogClose() {
      this.$refs.addFormRef.resetFields()
    },
    //点击按钮添加参数
    addParams() {
      this.$refs.addFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.post(`categories/${this.threeId}/attributes`, {
          attr_name: this.addForm.attr_name,
          attr_sel: this.activeName
        })
        if (res.meta.status !== 201) {
          return this.$message.error('添加参数失败！')
        }
        this.$message.success('添加参数成功!')
        this.addParamsDialogVisible = false
        this.getParamsData()
      })
    },
    //点击按钮，展示修改的对话框
    async showEditDialog(id) {
      //查询当前参数信息
      const { data: res } = await this.$http.get(`categories/${this.threeId}/attributes/${id}`, { params: { attr_sel: this.activeName } })
      if (res.meta.status !== 200) {
        return this.$message.error('查询参数信息失败')
      }
      this.editForm = res.data
      this.editParamsDialogVisible = true
    },
    //重置修改的表单
    editDialogClose() {
      this.$refs.editFormRef.resetFields()
    },
    // 点击按钮修改参数信息
    editParams() {
      this.$refs.editFormRef.validate(async valid => {
        if (!valid) return
        const { data: res } = await this.$http.put(`categories/${this.threeId}/attributes/${this.editForm.attr_id}`, { attr_name: this.editForm.attr_name, attr_sel: this.activeName })
        if (res.meta.status !== 200) {
          return this.$message.error('修改参数信息失败!')
        }
        this.$message.success('修改参数信息成功!')
        this.getParamsData()
        this.editParamsDialogVisible = false
      })
    },
    // 根据id删除参数
    async removeParams(attr_id) {
      const confirmResult = await this.$confirm('此操作将永久删除参数, 是否继续?', '提示', {
        confirmButtonText: '确定',
        cancelButtonText: '取消',
        type: 'warning'
      }).catch(err => err)
      // 取消删除
      if (confirmResult !== 'confirm') {
        return this.$message.info('取消了删除')
      }
      const { data: res } = await this.$http.delete(`categories/${this.threeId}/attributes/${attr_id}`)
      if (res.meta.status !== 200) {
        return this.$message.error('删除参数失败')
      }
      this.$message.success('删除参数成功!')
      this.getParamsData()
    },
    // 键盘按下Enter触发或者鼠标失去焦点触发
    async handleInputConfirm(row) {
      // console.log('ok')
      if (row.inputValue.trim().length === 0) {
        row.inputValue = ''
        row.inputVisible = false
        return
      }
      row.attr_vals.push(row.inputValue.trim())
      row.inputValue = ''
      row.inputVisible = false
      //发起请求保存操作
      this.saveAttrVals(row)
    },
    async saveAttrVals(row) {
      const { data: res } = await this.$http.put(`categories/${this.threeId}/attributes/${row.attr_id}`, { attr_name: row.attr_name, attr_sel: row.attr_sel, attr_vals: row.attr_vals.join(' ') })
      if (res.meta.status !== 200) {
        return this.$message.error('修改参数失败!')
      }
      this.$message.success('修改参数成功!')
    },
    // 点击按钮展开输入框
    showInput(row) {
      row.inputVisible = true
      //文本框自动获取焦点
      //$nextTick 方法作用当页面元素被重新渲染之后，才会指定回调函数中的代码
      this.$nextTick(_ => {
        this.$refs.saveTagInput.$refs.input.focus()
      })
    },
    //删除对应的可选项
    removeClose(i, row) {
      row.attr_vals.splice(i, 1)
      this.saveAttrVals(row)
    }
  },
  computed: {
    //如果按钮需要被禁用,则返回true,否则返回false
    isBtnDisabled() {
      if (this.selectedCateKeys.length !== 3) {
        return true
      }
      return false
    },
    //当前选中的三级分类的Id
    threeId() {
      if (this.selectedCateKeys.length === 3) {
        return this.selectedCateKeys[2]
      }
      return null
    },
    //动态计算标题的文本
    titleText() {
      if (this.activeName === 'many') {
        return '动态参数'
      }
      return '静态属性'
    }
  }
}
</script>
<style lang="less" scoped>
.shop {
  margin-top: 15px;
}
.el-cascader {
  margin-left: 15px;
}
.el-tag {
  margin-left: 10px;
}
.input-new-tag {
  width: 100px;
  margin-left: 15px;
}
.button-new-tag {
  margin-left: 15px;
}
</style>
